科研之友
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摘要
Soybean peroxidase (SBP), as a crude extract from soybean seed coats, was applied to remove 15 mM of phenols from coal-tar wastewater. The enzyme required for the conversion of phenols in coal-tar wastewater was less than that predicted by studies with synthetic wastewater. Step additions of both SBP and hydrogen peroxide reduced the SBP concentration requirement for >95% conversion of phenol. Polyethylene glycol (PEG) showed no improvement on the conversion efficiency, whereas sodium dodecyl sulfate (SDS) showed significant improvement that was better than step addition. Corroborative studies with synthetic wastewater have shown that Triton X-100 enabled the lowest SBP concentration for 95% conversion of 1.0 mM phenol followed by SDS, sodium dodecylbenzenesulfonate, and then PEG. Most significantly, evidence suggests that the anionic surfactants, SDS and sodium dodecylbenzenesulfonate, do not work in the same way as nonionic Triton X-100 or as PEG. Aluminum hydroxide gel (alum) was investigated for removal of polymeric colored products and surfactants after enzymatic reaction. The originality of this work lies, first, in the application of SBP to real industrial wastewater, with its catalytic lifetime extended by the presence of surfactant, and second, the picture that is emerging from the differences in mechanism by which various surfactant types and PEG effect such an enhancement. The impact of these new insights with surfactants is to enable SBP-based treatment to reach cost-effectiveness for industrial streams of the type studied here.
- 出版日期2010-11
